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參數(shù)資料
| 型號(hào)： | UCC3752N |
| 英文描述： | TELEPHONE RINGER|BICMOS|DIP|16PIN|PLASTIC |
| 中文描述： | 電話鈴聲| BICMOS工藝|雙酯| 16PIN |塑料 |
| 文件頁(yè)數(shù)： | 1/8頁(yè) |
| 文件大?。?/td> | 67K |
| 代理商： | UCC3752N |
UCC2751
UCC3751
DESCRIPTION
The UCC3751 controller is designed for driving a power stage that gener-
ates low frequency, high voltage sinusoidal signals for telephone ringing
applications. The controller and the power stage are most suitable for sin-
gle line applications where low cost, high efficiency and minimum parts
count are critical. In addition to providing the sinusoidal ringing signal, the
controller and the power stage are designed to provide the required DC
voltage across the output when the phone goes off-hook. The DC voltage is
also added as the offset to the ringing signal. This feature eliminates the
need to have a separate talk battery voltage power supply as well as relays
and drivers to switch between the ringing voltage and the talk battery.
The UCC3751 directly drives primary side switches used to implement a
push-pull resonant converter topology and transformer coupled sampling
switches located on the secondary of the converter. For normal ring signal
generation, the primary switching frequency and secondary sampling fre-
quency are precisely offset from each other by the ringing frequency to pro-
duce a high voltage low frequency alias signal at the output. The off-hook
condition is detected by sensing the AC current and when AC limit is ex-
ceeded, the sampling frequency is set to be equal to the primary switching
frequency to produce a DC output.
The drive signal frequencies are derived from a high frequency (3579545
Hz) crystal. The primary switching frequency is 89.488 kHz and the sam-
pling frequency is 20, 25 or 50 Hz less depending on the status of fre-
quency select pins FS0 and FS1.
Single Line Ring Generator Controller
FEATURES
Novel Topology for Low-Cost, Efficient
Generation of Ring Voltage
Provides DC Offset and “Talk Battery”
Voltage for Off-Hook Conditions
Selectable 20, 25 and 50 Hz Ring
Frequency
Secondary (AC) Current Limiting
Allows Removal of AC Voltage under
Off-Hook Conditions
Primary Current Limiting to turn Power
Stage off under Fault Conditions
Operates from a Single 12V Supply
APRIL 1999 - REVISED AUGUST 2000 - SLUS267B
1
10
15
4
ENABLE
VDD
DELAY
XTAL2
6
OHD
2
RINGEN
12
DRVS
9
VS12
5
11
13
DRV1
DCLIM
DRV2
16
XTAL1
8
FS1
7
FS0
14
PGND
3
GND
C
BYP2
SAMPLING
CIRCUIT
C
F
AC SIGNAL
V
OUT
V
1
C
R2
12V
C
DC
D1
DC SIGNAL
Q1
L
IN
V
IN
12V
T1
L
R
L
R
N:1
Q2
R
SENSE
UCC3751
3.579545MHz
C
R1
C
BYP1
TYPICAL APPLICATIONS CIRCUIT
UDG-98047
The circuits described in this datasheet are covered under US Patent #5,663,878 and other patents pending.
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